screen resolution on ubuntu

Hi, I just brought up my new computer on ubuntu 7.

System -> Preferences -> Screen Resolution only goes up 1024x768. My
monitor is 1600x1200, and Windoze was able to drive that just fine.
My graphics card is an NVidia GeForce 6150 SE.

In my /etc/X11/xorg.conf it said

Section "Screen"
Identifier "Default Screen"
Device "Generic Video Card"
Monitor "Generic Monitor"
DefaultDepth 24
SubSection "Display"
Depth 1
Modes "1024x768" "800x600" "640x480"
EndSubSection
...
SubSection "Display"
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSection

I changed '"1024x768"' to '"1600x1200" "1024x768"' on each "Modes"
line and rebooted. The system still wouldn't let me choose the higher
resolution.
Then I changed the "Device" line to "NVIDIA GeForce 6150 SE Video
Card" and tried to reboot, and the system couldn't bring up the
graphics, I had to reboot in safe mode and restore the xorg.conf file.
I'm really wondering if "Generic Video Card" and "Generic Monitor" are
limiting me, and what I should change them to.

.

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